Title :
Design of bipolar current source with amplitude up to 200 mA
Author_Institution :
Zhejiang Univ., Hangzhou, China
fDate :
6/1/1989 12:00:00 AM
Abstract :
One of the major requirements on the performance of a current source used for existing sensors is its amplitude stability. A method for designing a bipolar current source with amplitude up to 200 mA is developed. Its operating frequency is 10 kHz. The application of automatic control principles to the design of such a source makes the required amplitude stability possible. The circuit and its test data, including the maximum output amplitude, internal impedance, output regulation, and adjustment characteristic for an actual source, are given. This current source has successfully been used to excite the sensor of a continuous casting slag detector
Keywords :
bipolar transistor circuits; casting; constant current sources; eddy current testing; electric current control; electric sensing devices; power supplies to apparatus; stability; 10 kHz; 200 mA; adjustment characteristic; amplitude stability; automatic control; bipolar current source; continuous casting slag detector; eddy current detector; internal impedance; maximum output amplitude; output regulation; Circuit stability; Circuit testing; Eddy currents; Frequency; Impedance; Magnetic sensors; Operational amplifiers; Sensor phenomena and characterization; Slag; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
